One plot possibility is that Naruto's Truth - Seeking Balls are seen as a valuable asset by the RWBY characters. They might try to figure out how to replicate or use the power in some way. Another is that villains in the RWBY world would target Naruto specifically because of his powerful orbs. For example, Salem could see the Truth - Seeking Balls as a threat to her plans.
In this kind of fanfiction, Naruto's Truth - Seeking Balls would bring a whole new dynamic. The balls are made up of all five basic nature transformations and Yin - Yang Release. In RWBY, this could translate to being able to combat different types of Dust - based attacks. For RWBY characters, seeing Naruto use these orbs would be both fascinating and intimidating. He could use them to create barriers to protect the RWBY team during a Grimm invasion. Also, he might teach the RWBY characters some of his ninja skills, inspired by the unique properties of the Truth - Seeking Balls.
Well, in some fanfictions, Naruto might obtain the truth - seeking balls through a special encounter. Maybe he meets an ancient sage who bestows them upon him as a way to combat a new and powerful enemy. It could also be the result of some unique chakra manipulation or a once - in - a - lifetime transformation that gives him these powerful orbs.
He might be able to see through illusions more easily. Since truth - seeking balls are often associated with a certain level of 'truth' perception, they could enhance Naruto's ability to detect and break genjutsu that are used against him.
One implication could be that he would become even more of a force to be reckoned with. His combat abilities would be greatly enhanced, allowing him to defeat stronger opponents more easily.
In some fanfics, Naruto might obtain the Truth - Seeking Balls through a special training or a unique encounter. Maybe he discovers an ancient power source or is bestowed with the ability by a powerful entity. It could also be the result of a new form of chakra transformation that he unlocks during a life - threatening battle.
He could use them for offensive purposes, like shooting them at enemies with great force. They might be able to penetrate powerful defenses.
Maybe the plot could revolve around their combined combat styles. Naruto is known for his flashy and powerful ninjutsu, while Blake has her unique swordsmanship and shadow clones in RWBY. They could develop new fighting techniques together, like Naruto teaching Blake some of his chakra - based moves and Blake showing Naruto how to better use stealth in combat.
In fanfiction, if Naruto uses Truth - Seeking Balls, it could change the power dynamics in the Naruto universe. His friends and allies might rely on him more, and his enemies would be more fearful. Also, it might lead to new alliances or rivalries. For instance, some characters might want to learn from him how to use such a powerful ability, while others might see him as a threat to their own power and try to stop him.
Well, here's a plot twist. The Truth - Seeking Balls might start to react strangely with Naruto's Sage Mode. Instead of enhancing his power as expected, they create some sort of unstable energy that threatens to destroy him from within. This would force Naruto to find a way to either control this new power combination or get rid of the Truth - Seeking Balls. Another plot twist could be that the other villages see Naruto's new power as a threat to the balance of the ninja world and form a united front against him. Naruto then has to prove that he's not a threat and find a way to use his power for the good of all, rather than just his own village.
Well, it depends on the specific fanfiction. There are countless fan - created stories out there. Some authors might think it would be an interesting addition to Naruto's abilities, so they write him with the truth - seeking balls. However, not all fanfictions will follow this idea. Some might stay more true to the original powers in the Naruto canon and not give him this particular ability.